Furnace rabble arm and tooth construction



Nov. 26, 1929. CONNOLLY 1,736,769-

FURNACE RABBLE ARM AND TOOTH CONSTRUCTION Filed March 5, 1927 VIII/107% um/14 501 5 E. Una/m2? 351 a Gwen twp Patented Nov. 26, 19'...

s'ra'rss rsr OFFICE GEORGE E. CONNOLLY, OF OAKLAND, CALIFORNIA, ASSIGNOR TO NICHOLS COPPER COMPANY, OF NEW YGRK, N. Y., A CORPORATION OF NE! YORK FURNACE ARM AND TOOTH CONSTRUCTION Application filed March 5, 1927. Serial No. 173,145.

This invention relates to furnace rabble may be placed at a suitable angle transversely arms and teeth and has among its objects of the rabble arm to obtain the proper rabthe provision of an improved, durable and bling action and accordingly the cooperating light weight construction for the desired joining members 14, 15 and 16 may be placed r se at a corresponding angle transversely of the Various other specific objects, featuresand axis of the rabble arm. With the stop memadvantages will more clearly appear from the her 17 located at the side shown in Fig. 1 the detailed description iven bel w taken in condirection of travel of the rabble tooth through nection with the accompanying drawings the ore should be as indicated by the arrow,

0 which form a part of this specification. so that the force of the ore in engagement In the drawings, Fig. 1 is a transverse secwith the tooth will bring the tongue member tional view of a rabble arm showing a rabble 1 1 up against the stop member. tooth attached thereto according to this in- The cooperating arcuate joining members, vention; together with the stop member, serve to Fig. 2 is a longitudinal sectional view of rigidly retain the tooth in the desired worl-zy the construction such as shown in Fig. 1; and ing position free from vibration or rocking Fig. 3 is a view similar to F ig. 2, but showmovements and yet the tooth may be readily ing a modified form of construction. removed and is not liable to become jammed In Figs. 1 and 2 the main body portion or or wedged in a manner which might cause housing of a rabble arm is indicated at 10 the breakage of the parts or prevent renewal and within the same a cooling fluid conduit of teeth. It is evident that any tendency for as at 11 may be enclosed. Along the lower lateral movement of the teeth due to pivoting side of the member 10 a plurality of rabble at the tongue and groove joint is eliminated teeth as at 12 may be mounted at intervals. by reason of the arcuate form of this joint.

tion having a substantially vertical area 13 ing members substantially conform to the for engagement with the ore which to be curvature of the under side of the housing so rabbled. Along the upper edge of this area that no heavy thickened or irregular areas a suitable tongue or tenon portion 1a is proare necessary on the rabble arm housing memso vided for cooperating with and slidably joinher. A rabble arm of cylindrical cross-secing a correspondingly grooved portion at the tion and of great strength, but light in under side of the rabble arm comprising a weight, is thus provided. Also the eliminapair of depending flanged members as at 15 tion of thickened irregular areas and the like, and 16. The flanged members 15 and 16 are not only results in a saving in material, but preferably cast integral with the lower wall also prevents non-uniform temperature 0011- 5 of the rabble arm housing 10 and follow as ditions and the consequent destructive forces closely as possible the curved contour of this and strains which tend to arise within heated housing. In the example shown, the rabble metal parts of irregular dimensions. arm housing is of a cylindrical sha 3e and ac- The rabble tooth members are preferably cordingly the groove formed by the dependcast from suitable high temperature resisting flanges 15 and 16 is substantially arcuate ing metal and if desired, the working faces in form, the tongue portion 1% on the tooth of the teeth may be formedwith cavities or following along the same curve. The rabble other irregular areas as indicated at 18. tooth may be brought into or out of engage- The cross-sectional form of the tongue and ment with the rabble arm by sliding the groove joining members as shown in Figs. 1 tongue member 14 into and out of the groove. and 2 may follow a generally rectangular A stop member 17 at the end of the groove outline, but if desired for manufacturing may be formed as an integral part of the considerations or for other reasons, other rabble arm housing casting. shapes may be used, as for example in Fig. 3, 50 As indicated in the drawings, the teeth in which the coacting joining parts are subf Each of the rabble teeth may comprise a por- At the same time the tongue and groove join- 75 stantially circular in cross-section. That is, tooth members 19 are provided at their upper edges with rounded beaded or tongue portions 20 substantially circular in cross-section for engaging with corresponding grooves of circular cross-section formed by arcuate flange members as at 21 and 22. As in the construction above described, the flange members 21 and 22 may be cast integral with a rabble arm housing member 23.

The manner in which rabble teeth and rabble arms function in furnaces is disclosed, for example, in the patent to Herreshotf, 976,17 5, of November 22, 1910. That is, the rabble arms are designed to move over furnace hearths in a generally parallel relationship thereto, whereby the rabble teeth gradually advance the material under treatment from one part of the hearth to another.

While the invention has been described in detail with respect to particular preferred examples which give satisfactory results, it will be understood by those skilled in the art, after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended therefore in the a pended claims to cover all such changes anc modifications.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. The combination with a furnace rabble arm presenting an exterior, substantially arcuate surface facing downwardly at all times and movable in the sense that a given point thereon follows a circular path centered at one end of said arm, of a rabble tooth secured to said exterior surface of said rabble arm by relatively slidable tongue and groove sections integrally formed, respectively, with said arm and tooth, said sections being each substantially arcuate in form in correspondence with said arcuate surface.

2. The combination with a furnace rabble arm presenting an exterior, substantially arcuate surface facing downwardly at all times and movable in the sense that a given point thereon follows a circular path centered at one end of said arm, of a rabble tooth secured to said exterior surface'of said rabble arm by relatively slidable tongue and groove sections integrally formed, respectively, with said arm and tooth, said sections being each substantially arcuate inform in correspondence with said arcuate surface, said rabble tooth being disposed at an angle with respect to its direction of movement.

3. The combination with a furnace rabble arm presenting an exterior, substantially arcuate surface facing downwardly at all times and movable in the sense that a given point thereon follows a circular path centered at one end of said arm, of a rabble tooth secured to said exterior surface of said rabble arm by relatively slidable tongue and groove sections integrally formed, respectively, with said arm and tooth, said sections being each substantially arcuate in form in correspondence with said arcuate surface and being disposed and retaining said rabble tooth at an angle with respect to its direction of movement.

4. The combination with a furnace rabble arm presenting an exterior, substantially arcuate surface facing downwardly at all times and movable in the sense that a given point thereon follows a circular path centered at one end of said arm, of a rabble tooth secured to said exterior surface of said rabble arm by relatively slidable tongue and groove sections inte rally formed, respectively, with said arm and tooth, said sections being each substantially arcuate in form in correspondence with said arcuate surface and retaining said rabble tooth at an angle with respect to its direction of movement, and an abutment defining one end of said groove to limit movement of said rabble tooth with respect to said rabble arm.

In testimony whereof I have signed my name to this specification.

GEORGE E. CONNOLLY.

Joe 

